Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 626,174	$ 676,926
Accumulated depreciation and amortization	(380,496)	(353,492)
Property and equipment, net	$ 245,678	323,434
Minimum
Property, Plant and Equipment [Line Items]
Product warranty, weighted average period	15 months
Maximum
Property, Plant and Equipment [Line Items]
Product warranty, weighted average period	18 months
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 19,576	19,490
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 169,748	173,333
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 364,376	389,225
Equipment, furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Equipment, furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 72,474	$ 94,878